Problem

As a design engineer, you are asked to design a lighting system consisting of a 70-W power...

As a design engineer, you are asked to design a lighting system consisting of a 70-W power supply and two lightbulbs as shown in Fig. 2.124. You must select the two bulbs from the following three available bulbs.

R1 = 80 Ω, cost = $0.60 (standard size)

R2 = 90 Ω, cost = $0.90 (standard size)

R3 = 100 Ω, cost = $0.75 (nonstandard size)

The system should be designed for minimum cost such that lies within the range I = 1.2A ± 5 percent.

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Solutions For Problems in Chapter 2

82CP
83CP

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